Soft solder.



JOHN T. DWYER, OF ST. LOUIS, MISSOURI.

SOFT SOLDER.

No Drawing.

Specification of Letters Patent.

Patented Apr. 29, 11.911 3.

Application filed January 2, 1913. Serial No. 739,896.

To all whom it may concern:

Be it known that I, JOHN T. DWYER, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Soft Solder, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

- improved solder is tin.

This invention relates to soft solder, namely, solder such as is universally used by tinners andplumbers for uniting sheet tin, sheet copper or lead.

The main object of my invention is to provide a soft solder that is just as efficient as the soft solder now in general use but which can be manufactured at a much lower cost.

Another object is to provide a soft solder that will flow more freely than thesoft solder now in general use, thereby enabling a workmanto do more work with it in the same period of time than is possible with soft solder of the kind now universally used. And still another object is to provide a govel process of making my improved sol- The soft solder now in general use is composed of lead and tin or lead, tin and antimony. I have discovered that an efficient solder can be produced by usinga less quantity of tin and combining phosphorus with the other ingredients of the solder. By forming solder in this manner I effect a saving of from 7 to 15% tin used and I am thus able to materially reduce the cost of manufacturingsoft solder. In fact, my improved solder costs from five to seven cents per pound less to manufacture than the soft solder now in general use which is composed entirely of tin and lead or tin, lead and antimony. My not only less expensive than the soft solder now universally used, but it is more eflicient in that it flows more freely. and. does not oxidize as easily as solder that contains from 7 to 15% more The specific proportions of the ingredients are immaterial within certain limits so far as my invention is concerned as an efficient, practicable and marketable solder can be made by,combining from 50 to- 75% of lead with 25 to 50% of tin and adding from .01 to .057 phosphorus with said ingrediin the quantity of' cuts. A small quantity of antimony, say, for example, up to 2%, is preferably combined with the other ingredients abovementioned.

- In manufacturing my improved solder for general commercial purposes I have been able to save,from four to five cents per pound onsolder composed of the following ingredients mixed in approximately the proportions specified: 41-1 of tin, .02% of phosphorus, 2% of antimony, and the balance of lead. In addition to efl'ectinga great saving in the cost of manufacturing, the phosphorus fluxes and causes the metal to flow freely, it improves the appearance of the solder by making it smooth, and it prevents oxidation, thereby saving a large amount of dross.

The process that I prefer to use in manufacturing my improved solder consists in first melting the required amount of lead in a suitable receptacle, then adding the required quantity of tin and antimony to the molten lead and stirring or agitating said masfilby' any suitable means so as to thoroug Thereafter the phosphorus is introduced, it being preferable to introduce the phosphorus with an ordinary phosphorizer such, for example, as is used in phosphorizing copper. After the phosphorus is thoroughly melted the phosphorizer is removed and the molted mass is thoroughly stirred or agitated before the mixture is poured into the molds. Ordinary yellow phosphorus may be used in making my improved solder, or a subgtance known as phosphor-tin maybe use While I have found that the proportions herein specifically mentioned produce a solder that is thoroughly practicable for general commercial use, it will, of course, be understood that the proportions of tin and lead'could ,be varied somewhat without departing from the spirit of my invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A soft solder composed of lead, tin, antimony and from .01 to .05% of phosphorus.

2. A soft solder composed of lead, tin, antimony and phosphorus. I

3. A soft solder consistingof from 50 to y mix the lead and tin togetherr 75% lead, 25 to 50% tin, .05 to 2% ansignature in the presence of two witnesses, timony, ald fron .01 to .05? 'phoiphgrfis. this thirtieth day of December 1912.

4. A so t s01 er compose of t e 0 owing ingredients mixed in approximately the JOHN DWYER' 5 proportions specified: 41%70 tin, 2% anti- Witnesses:

mony, .02% phosphorus, and 56 lead. WELLS L; CHURCH, In testimony whereof I hereunto aifix my GEORGE BAKEWELL. 

